Gummed paper product



Patented July 26, 1938 GUMMED PAPER PRODUCT Ferdinand W. Humphner, OakPark, Ill., as-

signor, by mesne assignments, to Mid-States Gummed Paper 00., acorporation of Delaware No Drawing. Application May 20, 1936, Serial No.80,897

8 Claims.

This invention relates to gummed paper prod nets and is particularlyuseful in connection with re-moistening adhesive tape. This applicationconstitutes an improvement upon my pending application Serial No.726,796 for Gummed paper products.

An object of the invention is to provide a.

gummed tape of great flexibility which is extremely quick inre-moistening and which is able to take care of excess amount ofmoisture. Other specific objects andadvantages will appear as thespecification proceeds.

In the practice of my invention, any suitable kraft paper may beselected for gumming. To

one side of the paper is applied a thin layer of adhesive material suchas dextrine, starch or inferior glue or any of the above in combination.

Vegetable glue is useful in that it produces with the paper a readilyflexible tape. To the top surface of the first layer or strata ofadhesive, I apply a powdered animal glue. The animal glue and vegetableglue may be applied in different relative quantities depending upon thequality of the finished tape required. A good quality product can beobtained by applying one-half the total weight of adhesive in the firstlayer of dextrine, starch, inferior glue, etc., and one-half of thetotal weight of adhesive in the higher quality adhesive or animal glue.

I prefer to prepare the powdered animal glue in the following manner.The animal glue is caused to foam by thoroughly removing the greasetherefrom 'or by incorporatlngchen icals to induce foaming. Whenthe foamis well developed, the glue liquor is passed over a hot drum toevaporate the moisture. The finely divided glue is then scraped off andafter being subjected to further pulverizing the product is found not toclog or become lumped.

Any suitable material for causing the animal glue to foam may beemployed. As an example calcium citrate and sodium silicofiuoride may beused; Also.ifdesired,thegreasemayberemoved and at the same time thefoaming agents added. i

The powdered glue obtained as above described is sifted or dustedpreferably by mechanical means, over the freshly gummed or moistenedsurface and is permanently bonded'to this surface. The layer of dustedglue tends to remove moisture from the lower strata and become slightlyembedded in the lower strata. The tape with the two layers is thenpassed between high pressure rolls so as to embed further quantities ofthe dried adhesive into the first layer. At the same time, the rollsimpart a high glossy finish to the glue. As the heat is applied, theopacity of the dried glue is substantially reduced and it begins to takeon more of its original translucent appearance. 6 The application of thepowdered animal glue produces at least two new results. In the first'place, it represents a considerable saving in the drying operation andmakes the glue much easier to handle. In the second place, the brokenouter 10 surface of the final product has much greater ability tore-moisten. At the same time, if ex-' cessive moisture is applied it iscarried at once to the more soluble layer below which is able to absorbthe moisture. I By causing the animal glue to foam before applyingit tothe hot roller I find that it is possible to finely divide the glue to agreater extent than has been heretofore possible. The

operation is accomplished in a very brief interval V and at very slightexpense. At the same time, the product lends itself readily to furtherpulverizing and exhibits no tendency to clog or lump, thus making it]extremely easy to handle. I found that the drying operation with respectto the forming of the gum tape is reduced less than half because thepowdered glue quickly absorbs any excess moisture in the lower layer.

The powdered adhesive on the top surfaceof the resulting blended, layerspresents a rather broken or cracked appearance that enables moisture topass readily through the top layer and also enables the top layer to bemore readily re-moistened.

While in the foregoing specification I have set forth certain specificmaterials and steps, it will .be understood that these may both bevaried considerably without departing from the scope of my invention.

The foregoing detailed description has been 4 given for clearness ofunderstanding only, and no unnecessary limitations should be understoodtherefrom, but the appended claims should be construed as broadly aspermissible, in view of the prior art. 7

I claim: 1

l. Are-moistening tape of the character set forth comprising: a paperstrip, a water-pervious layer of adhesive consisting mainly of vegetableadhesive covering said paper, and a layer of 60 powdered animal glueembedded in said first ,2. A re-moistening tape of the character setforth comprising: a paper strip, a water-pervious layer of vegetableadhesive covering said paper, I

and a layer of powdered water-soluble animal glue extending over saidfirst mentioned layer and being partially embedded therein.

3. A re-moistening tape 0! the character set.

forth comprising: a paper strip, a vegetable adhesive thereon, and alayer of powdered adhesive applied to the top surface thereof, saidpowdered esive presenting a top surface which is broken in characterandresponds readily to re-moisten- 5. A re-moistening tape oi the .v setforth comprising: a paper strip, a layer of vegetable adhesive coveringsaid paper, and a layer of powdered m a: glue embedded within saidvegetable adhesive and providing a broken top pulverized glue to surfacethrough which 6. In a proeew for preparing a gummed tape, the steps ofapplying a vegetable glue to a paper and applying to said vegetable gluean animal glue which has been w:- ed, dried, and pulverized. g

7. In a proeessfor preparing a gumrned tape, the steps of applying avegetable glue to a paper surface, 11wg to said vegetable glue an animalglue which been foamed, dried, and pulverized, and pr said animalglue soas to embed it in said vegetable. glue.

8. In a process for preparing a .11 tape, applying vegetable glue to asurface, applying to said vegetable glue is pulverized animal glue, andapplying heat d pressure to the surface of said w d it wit saidvegetable moisture may readily lue.

